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The line-integrated difference in index obeys delta-n=5E-6*(8/10) = 4e-6. So to get less than one arcsec of beam wavefront deflection we need to have the line integral of temperatures differ by no more than 4K.
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The line-integrated difference in index obeys delta-n=5E-6*(8/10) = 4e-6. So to get less than one arcsec of beam wavefront deflection we need to have the line integral of temperatures differ by no more than 4K.
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